The solar power industry is in the middle of a spectacular growth spurt in the United States, especially in densely populated areas.

Last year, 20 cities – representing only about 0.1% of U.S. land area – accounted for a stunning 6.5% of U.S. solar photovoltaic (PV) capacity, according to a recent report by Environment America, a Boston-based non-profit focused on energy and environmental policy issues.

The report, called Shining Cities, ranked the 65 largest U.S. cities based on the total amount of solar PV capacity installed within the geographic limits of each city. About 1.3 gigawatts (GW) of solar PV capacity has been installed in the 65 largest U.S. cities cumulatively, according to the report.